com.generallycloud.baseio.component.ssl.ApplicationProtocolUtil Maven / Gradle / Ivy

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/*
 * Copyright 2015-2017 GenerallyCloud.com
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 
package com.generallycloud.baseio.component.ssl;

import java.util.ArrayList;
import java.util.List;

final class ApplicationProtocolUtil {
    private static final int DEFAULT_LIST_SIZE = 2;

    private ApplicationProtocolUtil() {
    }

    static List toList(Iterable protocols) {
        return toList(DEFAULT_LIST_SIZE, protocols);
    }

    static List toList(int initialListSize, Iterable protocols) {
        if (protocols == null) {
            return null;
        }

        List result = new ArrayList(initialListSize);
        for (String p : protocols) {
            if (p == null || p.isEmpty()) {
                throw new IllegalArgumentException("protocol cannot be null or empty");
            }
            result.add(p);
        }

        if (result.isEmpty()) {
            throw new IllegalArgumentException("protocols cannot empty");
        }

        return result;
    }

    static List toList(String... protocols) {
        return toList(DEFAULT_LIST_SIZE, protocols);
    }

    static List toList(int initialListSize, String... protocols) {
        if (protocols == null) {
            return null;
        }

        List result = new ArrayList(initialListSize);
        for (String p : protocols) {
            if (p == null || p.isEmpty()) {
                throw new IllegalArgumentException("protocol cannot be null or empty");
            }
            result.add(p);
        }

        if (result.isEmpty()) {
            throw new IllegalArgumentException("protocols cannot empty");
        }

        return result;
    }
}